a gold watch --> a very rich person
Whose gold watch is this ?
I think it is the very rich person's ( gold watch )
a tray --> the waiter
Whose tray is this ?
I think it is the waiter's ( tray )
a gun --> a gangster
Whose gun is this ?
I think it is the gangster's ( gun )
glasses --> the last customer
Whose glasses are these ?
I think it is the last customer's ( glasses )
a music sheet --> the pianist
Whose music sheet is this ?
I think it is the pianist's ( music sheet )
a handbag --> the lady singer
Whose handbag is this ?
I think it is the lady singer's ( handbag )
